Socket Head Cap Screw, Head Type Standard, System of Measurement Inch, Drive Type Torx Plus, Drive Size 45IP, Material Alloy Steel, Material Grade/Class Class 12.9, Finish Black Oxide, Thread Size 5/16 In.-18, Minimum Thread Length 1 1/2 in, Fastener Length 1 1/2 in, Head Height 0.112 in, Head Diameter 0.183 in, Pack Size Small Pack, Thread Style Partially Threaded, Special Features Not Applicable, Countersink Angle Not Applicable, Manufacturer Location Made in US